Modems for VHF digital voice
It would be nice to make some re-use of existing FM VHF radios. So is it possible to come up with a waveform that can pass through legacy FM radios, but also be optimally demodulated with a SDR?ROWETEL

Whitepaper on soldering aluminum
One of his most visible accomplishments can be easily seen if you live in the SF bay area; he developed the welding process for the steel/aluminum third rail on the BART system.Life of Kenneth

How to build a low-tech internet
The low-tech alternatives result in much cheaper and very energy efficient networks that combine well with renewable power.Low Tech Magazine

How to

A tutorial for launching your first balloon
There are a lot of reasons to put together a weather balloon launch. It's a great project for a STEM class, it requires planning, electronics and programming, and teamwork.Tracksoar